blackcat
My experience is from a few years ago, but I did an art foundation (and went on to study Fine Art to MA level), and hope some of these ideas might help. I wouldn't worry too much about not doing a portfolio prep course - they are expensive and a good way for a college to make some extra dosh. With a bit of focus your daughter can make sure she has covered off the things they will be advising.
Firstly, what Camberwell wants and what the Drawing School wants may be slightly different so make sure you follow their rules, for example number of works shown, how to label them etc.
It is best to keep the portfolio quite tight, ie do not just put in everything in order to bulk it out. One or two good life drawings will be better than tons and tons of the same thing. There will probably be a max of about 20 pics needed.
Observational drawing will be important, that is drawing done from life, not from photos. On a portfolio prep course (and on a foundation course) they will be taking the students to places where they can do drawing and sketching from things in front of them. Your daughter could spend a couple of afternoons in a museum or art gallery doing drawings of things that interest her, such as sculptures, 3-d objects, old stuff, new stuff. Try to do a lot and pick the best ones.
It is also good to find a place where you can observe people coming and going and do drawings of that - quick, overlapping drawings of people moving about.
Do they do life drawing at school? If so, it is good to have one or two finished, long pose drawings but also some quick, 5 minute drawings (labelled as such) which will be more fluid and have a quicker style.
One of the things they may well be looking for is the use of line. Rather than have the same strength of line all the time, make sure drawings in the portfolio reflect lightness, darkness, shading, hard lines, soft lines, ie some kind of sensitivity of hand/medium if that makes sense. You are not aiming for a photo-realistic image but something that is a record of time and space and your hand and pencil/pen on the paper at that time (sorry if that sounds a bit wanky. It's art, dahling!)
Remembering things from my foundation course, we also did some exercises where we would 'make marks' to music - very freeing. Again, might be an idea to include some of this.
A range of mediums is good to show, so pencil, pen, any printing etc. If using colour, show that you've understood and selected a particular colour, for example using a limited colour palette, maybe just three colours.
Some of the outside sketching could then be used to make up, for example, an abstract painting. Take a small portion of a sketch she enjoyed doing, play around with it, enlarge the scale, add colour. A delicate line drawing of a marble statue's bum could become an abstract painting.
Be prepared to be able to look at a piece of work and critique it. Your own work and others. When selecting students they want them to be able to participate in a group and respond to each others work. You learn a lot this way and it teaches you to look critically at your own work.
Hope some of this is helpful. Lots of luck. 